Machine-translated by Google. Questions are authored in English.
Top

Discussion

A trickling filter treats sewage by

  • A.straining it through a fine woven fabric
  • B.holding it in a sealed tank without oxygen
  • C.mixing it with lime to precipitate solids
  • D.passing it over media colonised by microbial biofilm

Answer: D

Sewage is distributed over stones or plastic media carrying a slime layer of bacteria, fungi and protozoa, and organic matter is absorbed and oxidised as the liquid trickles down. Air moving through the bed supplies the oxygen, so it is an aerobic fixed-film process.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.